<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>数据统计</el-breadcrumb-item>
            <el-breadcrumb-item>数据报表</el-breadcrumb-item>
        </el-breadcrumb>
         <!-- 卡片视图区域 -->
         <el-card>
            <!-- 2.为 ECharts 准备一个定义了宽高的 DOM -->
             <div id="main" style="width: 750px;height:400px;"></div>
         </el-card>
    </div>
</template>
<script>
// 1.导入echarts
import * as echarts from 'echarts'
import _ from 'lodash'

export default {
  data () {
    return {
        // 需要合并的数据
        options: {
          title: {
            text: '用户来源'
          },
          tooltip: {
            trigger: 'axis',
            axisPointer: {
              type: 'cross',
              label: {
                backgroundColor: '#E9EEF3'
              }
            }
          },
          grid: {
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
          },
          xAxis: [
            {
              boundaryGap: false
            }
          ],
          yAxis: [
            {
              type: 'value'
            }
          ]
        }
    }
  },
  cerated () {},
  // 此时页面上的元素已经被渲染完毕了
  async mounted () {
    // 3.基于准备好的dom，初始化echarts实例
    var myChart = echarts.init(document.getElementById('main'));

    const { data: res } = await this.$http.get('reports/type/1')
    if (res.meta.status !== 200) {
        return this.$message.error('获取折线图数据失败!')
    }
    // 4.准备数据和配置项
    const result = _.merge(res.data, this.options)
      // 5.展示数据
      myChart.setOption(result)
  },
  methods: {}
}
</script>
<style scoped lang="less">

</style>
